| Probus Properties Ltd | Real estate | 1999 |
| PROCESS360 Ltd | Information & communication | 2017 |
| Producer Meats Limited | Wholesale & retail | 2012 |
| Productive Living Limited | Health & social care | 1998 |
| Profere Facility and Domestic Services Ltd | Administrative & support | 2023 |
| Professional Assist Ltd | Administrative & support | 2019 |
| Professional Inventories Franchise Ltd | Administrative & support | 2025 |
| Professional Property Services Ltd | Construction | 2023 |
| Profitpath Business Consulting Ltd | Professional & scientific | 2023 |
| Profitz Electrical Limited | Construction | 2024 |
| Programus Limited | Information & communication | 2000 |
| Progress Forward Ltd | Information & communication | 2020 |
| Progressive 89 Ltd | Construction | 2017 |
| Progrill Ltd | Administrative & support | 2017 |
| Prohome Property Group Limited | Real estate | 2023 |
| Project Chang Ltd | Wholesale & retail | 2024 |
| Project Controls Services Ltd | Professional & scientific | 2015 |
| Project Design Construction Ltd | Construction | 2019 |
| Projest Ltd | Professional & scientific | 2020 |
| Projex Broadway Ltd | Construction | 2023 |
| Projex Investments Ltd | Real estate | 2020 |
| Projex Property Development Ltd | Construction | 2023 |
| Proman Trades Limited | Professional & scientific | 2016 |
| Promark Consultants Limited | Professional & scientific | 2020 |
| Promedia Group UK Ltd | Information & communication | 2025 |
| Promico Engineering Ltd | Construction | 2024 |
| Propeg Systems Limited | Information & communication | 2008 |
| Properties KV Ltd | Real estate | 2024 |
| Property Building Services Group Limited | Other services | 2011 |
| Property Deco Ltd | Construction | 2026 |
| Property DVS UK Ltd | Real estate | 2025 |
| Property Fortress Education Ltd | Education | 2014 |
| Property Land Limited | Real estate | 1995 |
| Property Lifestyle Limited | Financial services | 2017 |
| Property Pelican Ltd | Real estate | 2020 |
| PROPERTY4USGROUP Ltd | Real estate | 2024 |
| Propertyvise Ltd | Real estate | 2025 |
| Proporting Ltd | Manufacturing | 2012 |
| Prosek Partners Limited | Extraterritorial | 2012 |
| Prosek UK Limited | Information & communication | 2011 |
| Prosperity Through Collaboration Limited | Professional & scientific | 2016 |
| Protaxes Ltd | Professional & scientific | 2019 |
| Proteam Building and Painting Ltd | Construction | 2018 |
| Protech GRP Limited | Construction | 2017 |
| Protech Scaffolding (Holdings) Limited | Financial services | 2014 |
| Protein Blends Ltd | Wholesale & retail | 2024 |
| Proved Potential Ltd | Education | 2025 |
| Provident Assets UK Ltd | Real estate | 2019 |
| Provincial Flats Limited | Financial services | 1936 |
| Proximity Plumbing Ltd | Construction | 2022 |
| PSM Neurosurgical Services Ltd | Health & social care | 2023 |
| PSP Patel Limited | Health & social care | 2026 |
| PSP Services Limited | Construction | 2001 |
| PSV Diesel Engine's Direct Ltd | Wholesale & retail | 2025 |
| Public Opinion Research Limited | Professional & scientific | 2011 |
| Pufferr Ltd | Information & communication | 2019 |
| Puket Builders Limited | Construction | 1981 |
| Pulse Software Limited | Information & communication | 1995 |
| Pumas Basketball Limited | Arts & recreation | 2013 |
| Punt and Bdellium Resources Ltd | Professional & scientific | 2023 |
| Puppet Master Theatre Ltd | Arts & recreation | 2025 |
| Purdy's of Cheam Ltd | Transport & logistics | 2022 |
| Pure Aesthetics Surrey Ltd | Other services | 2024 |
| Pure Plumbing Limited | Construction | 2013 |
| Pure-Radiance (Surrey) Ltd | Construction | 2024 |
| Puredrive Energy Ltd | Manufacturing | 2016 |
| Pureheat Plumbing & Heating Ltd | Construction | 2024 |
| Puri Financial Consultants Limited | Professional & scientific | 2018 |
| Purton Heights Ltd | Construction | 2021 |
| PUT a LID on IT Ltd | Construction | 2025 |
| Puttinu Cares Foundation | Health & social care | 2016 |
| PV Realty Limited | Real estate | 2017 |
| PVI Group Ltd | Other services | 2025 |
| Pvpk Ltd | Real estate | 2022 |
| PW Air Conditioning Limited | Construction | 2012 |
| Pwmech Ltd | Construction | 2025 |
| Pyara JAS Food & Wine Ltd | Wholesale & retail | 2025 |
| Pypy Ltd | Transport & logistics | 2022 |
| Q Business Consulting Limited | Professional & scientific | 2006 |
| QDL Training Limited | Education | 2016 |
| QH Group Ltd | Construction | 2023 |
| Qiangora Limited | Administrative & support | 2018 |
| Qiqi Oriental Supermarket Ltd | Wholesale & retail | 2022 |
| QL Beauty Ltd | Other services | 2024 |
| Qonqord UK Ltd. | Administrative & support | 2007 |
| QSN Traders Ltd | Real estate | 2020 |
| QU4TRE Ltd | Wholesale & retail | 2025 |
| Quadrant Medical Diagnostics Limited | Wholesale & retail | 2014 |
| Quality 4 YOU Limited | Wholesale & retail | 2002 |
| Quality Stitch ( Wimbledon) Limited | Other services | 2020 |
| Quality Trade Construction Limited | Construction | 2022 |
| Quality Vista Limited | Information & communication | 2008 |
| Quantforge Ltd | Information & communication | 2026 |
| Quantridge Technologies Ltd | Information & communication | 2024 |
| Quantsolns Ltd | Financial services | 2014 |
| Quantum Build Services Ltd | Construction | 2022 |
| Quantum Group Services Limited | Administrative & support | 2004 |
| Quantum Latitude Ltd | Transport & logistics | 2026 |
| Quantum Paul Ltd | Information & communication | 2025 |
| Quantum Way Limited | Administrative & support | 2020 |